Have you tried to translate using these instructions:
Translate text
You can easily translate text in different apps on Mac, including some third-party apps. You can also use Live Text to translate text in an image.
- Select the text you want to translate.
- Control-click the selected text, then choose Translate [text].
- From the language pop-up menus, choose the language of the text you’re translating and the language you want to translate it into.
This is the built in macOS translation when using Safari , double click to translate is most likely a google chrome extension.